gargantua
A free physics simulation — play it in your browser, no install. GARGANTUA — Schwarzschild black hole raytracer. Full-screen real-time GLSL null-geodesic integration, event horizon + photon ring + multiple disk crossings + Doppler beaming + gravitational redshift. No build step, vendored three.js.
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Open the live demo Source on GitHubFrom the README
**在线演示 → ** · **源码 → **
参数表、预设、调试视图、画质档全部集中在 js/params.js——HUD、持久化与 URL 接口都由它派生， 改一处即可全局生效。
倾角定义：0° = 沿盘法线俯视（正面），90° = 与盘面共面（边缘）。
脚本用零依赖 CDP 驱动本机 Chromium：等待 __GARGANTUA_READY__、收集控制台错误与未捕获异常、 调用 analyze() 输出像素统计并保存 PNG；任何控制台错误都会让退出码非 0。
测地线积分. 由相机位置与视线确定轨道平面，以 u = 1/r 为变量积分 d²u/dφ² = −u + 3M u²（四阶 Runge–Kutta）。步长 h = clamp(κ/u, h_min, h_max)，
终止条件. u ≥ 1/r_s → 落入事件视界，返回纯黑；到达逃逸半径且向外 → 采样天球。
吸积盘. 盘面是过原点的倾斜平面。每一步检测 dot(pos, n_disk) 是否变号， 插值出交点后做发射–吸收合成（前向透射率），因此近侧盘面会遮挡远侧与背景星空。
观测温度 T_obs = g·T_emit，玻尔兹曼亮度按 g⁴ 缩放——这正是边缘视角下接近侧比远离侧亮数倍的原因。
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